My base Yoko's developed cracks in the tread area (down in the grooves) around 20k,,,tires were 3yrs.old...I watched them for another 5k & then they got replaced...
I got Z w/9,000 miles on 6/13'-car was built 11/10' / so there was some sitting time on this one also.
looking back at record's...Replaced 3/14'-just over 3yrs.old: i can't remember date code that was on tires/they were probably closer to 4.
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